Just like 3d printing plastic doesn't compete with injection molded plastics, 3d printed buildings don't compete with prefabricated buildings. That is to say,

Just like 3d printing plastic doesn't compete with injection molded plastics, 3d printed buildings don't compete with prefabricated buildings. That is to say, if you're trying to build something expensively, and slowly, with a lot of compromises and flaws, 3d printed buildings are for you.